[gdal-dev] Warped VRT and overviews

[Sean Gillies]

Hi all,

It's been my understanding that GDAL's RasterIO (most current version) uses
overviews when available, implicitly. Is this also true for VRTs and warped
VRTs or is not true?

I ask because 1) in reading from a warped VRT (using vsicurl) I'm not
seeing use of the overviews in the GeoTIFF source that surface in the VRT,
and 2) in reading the source of gdalwarp_lib.cpp I see that it has its own
code for navigating overview levels and does not rely on any implicit
overviews.

Thanks in advance,

-- 
Sean Gillies
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